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Failure rate and event data for use within land use planning risk assessments

This document details HID CI5’s established set of failure rates. For items not within this set, or for which no values are currently available the inspector carrying out the assessment should estimate failure rates after discussions with Topic Specialists.

The failure rates quoted within this document were derived and are intended for use on Land Use Planning cases. They were NOT originally intended for use in COMAH Safety Report Assessment because they do not necessarily take account of all factors that could be relevant and significant at particular installations.

View failure rate and event data for use within land use planning risk assessments